Punching machine



. March 4 1924.-

1,485,961 E. c. CLARKE PUNCHING MACHINE Filed Jan. 19 1.922 5Sheets-Sheet 1 March 4 1924. 1,485,961

V E.C.CLARKE PUNCHING MACHINE Filed Jan. 19, 1922 3 Sheets-Sheet 2 March4,1924. 1,485,961

E. C. CLARKE PUNCHING MACHINE Filed Jan. 19, 1922 3 Sheets-Sheet 5Patented Mar. 4, 1924.

UNITED STATES PATENT OFFICE;

EUGENE G. CLARKE, 0F CHAMBERSBUBG, PENNSYLVANIA, ASSIGNCTR T0 CHAMBEES-U BURG ENGINEERING COMPANY, OF CHA'MBERSBU RG, PENNSYLVANIA, ACQRPOB-A-TION OF PENNSYLVANIA.

rononrne MACHINE. i

7 {application filed January 19, 1922. serial No. 6539,1308.

To all whomit' may concern:

Be it known that I, EUGENE C. CLARKE, a citizen of the United States,residing in Chambersburg, Pennsylvania, have invented PunchingfMachines,of which the following is a specification.

My invention relates to punching and like machines, the main object ofthe invention being the provision in machines of this type of improvedandsimplified means'for facilitatingthe accurate location of the toolupon thework. r

In'the attached drawings:

Y Figure. 1, is a side elevation of a punching machine of the verticaltype made in accordance with my invention;

Fig. 2, is a fragmentary longitudinal sectional view illustrating thedetails of my invention;

- Fig. 3, is a view similar to Fig. 2, further illustrating theoperationof the device, and

' Fig. 4, is a plan view of one of the stop elements.

With reference to the drawings, 1 indicates' the frame of the machine,in which is mounted inthe usual manner a sliding head 2. Carried by thesliding head 2 is a detachable punch block3, said block having in thepresent instance a vertical recess 4 extending thereinto from the nethersurface, saidrecess being cylindrical in form and having its mouth 5restricted, as clearly shown in Figs. 2 and 3. Within the recess 4 isestablished a punch stock 6, said stock being; of such diameter as topass neatly through the mouth 5 of the recess and having an extension orflange 7 on that part which occupies the main chamber of the recess 4,which prevents withdrawal of the stock through the mouth 5. A spring 8is shown, in the present instance, established between the top of therecess 4 and the upper surface of the flange 7, said spring tending atall times to force the stock 6 into the bottom of the recess.

In vertical punches, such as that illustrated herein, this spring may,if desired where the stock is sufliciently heavy to insure its fallingtothe bottom of the recess4 under the force of gravity, be eliminated,

the; spring or: its equivalent being essential, however, in horizontalpunches. The punch stock 6 is adaptedin theusualmanner to carry the toolor punch 6 and the usual I anvil 1 is provided for supporting the work,which latter in the present instance is indicated by the referencenumeral 9, in position to be operated upon by thesaid tool.

The usual stripper 10 is shown by means of which the work is strippedfrom the punch on its upward stroke. r

Extending through the-side of the punch block 3 and into the recess 4isan opening 11, in which isslidably mounted a rod 12, the outer end ofthe rod being attached to one arm of a bell crank lever 13 pivotallysecured at 14 to the punch block3. I Extending downwardlyfrom the frame1 is a stud 15, to

which stud are adjustably secured by means i of set screws 16, 16, apairof stops 17 and 18, said stud and stops being so positioned as to lie inthe pathgof the outer endof the arm 13 of the bell crank lever 13'as itis verticallyreciprocated with the punch block 3.

Figs; 2 and 3 illustrate the cycle of operations when my device isemployed for fa cilitating the location of the punch on the work. InFig. 2, the head 2 of the punch has been elevated to the top of itsstroke, and the stop 17 is so-positioned upon the stud 15 that with thehead in this position thelever 13 has been engaged by the said stop 17and the rod 12 withdrawn from the recess 4, this withdrawal-of the rod12 havingthe effect of releasing the stock 6 and permitting it to dropunderv the action'of gravity or the pressure of the spring 8 until thepunch rests upon the work 9. With the tool resting upon thesurface ofthe work in this manner, itis only necessary for the operator of themachine to shift the work until the teat 7? of the punch enters thedesired counterpunch indicating the center of a hole to be formed in thework. With the downward movement'of the head 2, the punch stock re mainsstill until the top wall of the recess 4 engages the top of the stock,after which continued downward movement of 'the head forces the punchthrough the plate.

" During the actual punching operation, the

' jects into the recess 4. below the flange 7 as shown in Fig. 3. In theensuing upward motion of the head 2, the pin 12 prevents movement of thestock relative to the block 3, said rod retaining the stock in the topof the recess a until the lever 13 again engages the upper stop 17.During the period of time that the stock 6 is being elevated after thepunch is stripped from the1-ho.le,.-the operator may shift the work 9until he has brought into a position-approximately under the punch a newarea in which it is desired to form a hole, so that the final adjustmentof the work to bring it into the exact position relative to the tool,which is accompe lished after the'stock has been released and while thetool rests upon the upper surface of the plate, is-a comparativelyslight one.

As shown, in Fig. 4, the upper stop 17 is flattened at oneside,jso thatwhen this flattened portion is turned towards the bell crank lever 13,the latter will clear the stop, the rod 12 accordingly remaining in theadvanced position and retaining the "stock 6 in the top of the recess;The punch thus remains fixed and immovable in the head.

' "I claim:

1; The combination with a frame, of a head slidable' therein, means forreciproeating said head, a tool carried by the head and movable withrespect thereto, an 'element 'movably mounted in the head and adaptedinone position to engage and retain the tool immovable therein and inanother position 'to disengage the tool, a second element movablymounted on the head and connected with the retaining element, and a'pa'irof spaced elementscarried by the frame and adapted to engage thesaid second element at opposite ends of the stroke of'said head toactuate theretaining element in difierent directions.

'2. The combination with a frame, of a head movably mounted in saidframe, means for reciprocatingsaid'head,said head having a recess, atool-carrying element mounted in'said recess and capable of freemovement therein with respect to the head, a spring tending to retainthe tool-carrying element in one end of said recess, means movablymounted in the head for retaining the tool-carrying element in theopposite end of said recess, and means operable at the en'd'of eachstroke of the head for actuating said retaining means to alternatelyengage and disengage the tool-carrying element.

3. The combination with a frame, of a head movably mounted in saidframe. means for reciprocatingsaid head, said head having a verticalrecess extending inwardly from the under side thereof, a tool-carryingelemea er;

ment mounted in said recess and capable of limited vertical movementthereln, means movable in the head for retaining Vthe toolcarryingelement in the upper end of they recess, and means operable at the top.and

bottom of the stroke of the head for actuatingsaid retaining means toalternately engage and' disengag the tool-carrying ele ment.

head slidable therein, means for reciproeating the head, a tool carriedby the head and movable with respect thereto, an element novably mountedin the head and adapted in one position to engage and-retain the toolimmovable therein and in another position to disengagethetool, a

The combination with a frame, of a second element movablvmou'nted on thement therein with respect to the head, means tending to retain the toolcarrying element in one end of said recess, a membersli'dably mounted inthe head and adapted to enter the recess and engage the tool-carryingeleient to retain it in the opposite end of said recesa'a bell cranklever pivotallymounted on the head and connected with saidmember, and apair of spaced elements carried by the frame in position to be engagedby the bell crank lever respectively at top and bottom of the stroke ofthe head for actuating the pin to alternately'engage and disengage thetool-carrying element.

6. The combination with a frame, of a head mounted in, said frame, meansfor re-' 'ciproeating sald head,sa1d head'having a recess, a toolcarryinelement mounted in said reces and capable of free movement therein withrespect to the head, means for retaining the tool-carrying element inthe recess, means tending to advance the toolcarrying element to theouter end ofthe recess, means for retaining the tool-carrying elementina retracted position in the recess, and means for actuating saidretaining means to engage the element at the forward end of the strokeof said head and to release the' element at the rear end of the stroke.

7. The combination with a frame, of'a head 'slidable therein, means forreciproeating said head, a tool carried by the head" and movable withrespect thereto, an element movably mounted in the head and adapted inone position to engage and resecond element at opposite ends of the tainthe tool immovable therein and in stroke of said head to actuate theretaining another position to disengage the tool, a element in differentdirections, and means 10 second element movably mounted on the foradjusting one of said spaced elements 5 head and connected with theretaining eleto prevent engagement thereof by said ment, 3 pair ofspaced elements carried by second movable element. the frame and adaptedto engage the said EUGENE C. CLARKE.

